Coloured dots on airports

When you look at a airport there’s either a green or red dot in the middle. What does this mean?

Green- VFR (Visual flight rules) conditions. More than 5 nautical miles visibility

Blue- MVFR (Marginal VFR) 2-5 (I think) nautical miles visibility

Red- IFR (Instrument flight rules) <2 nautical miles visbility

Remember you can still fly IFR in MVFR or VFR conditions, commercial aircraft legally have to always fly IFR

(Thanks to @ewanfleming for correcting me)

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